![if the sun turned into a black hole if the sun turned into a black hole](http://i1.wp.com/www.universetoday.com/wp-content/uploads/2013/09/1.13743-C0141244-Black_hole_artwork-SPL-1.jpg)
It wouldn't be a black hole then, just a dead star right? To be a black hole, it would need to be so massive and dense that it's gravitational forces would bend light. We could, however, observe light bend radically around the sun near the event horizon, as light could pass through what is now near the sun's core. No gravitational disturbances, as neither our orbital radius nor the mass of the sun has changed. If by some magic our sun was compressed to less than the Schwarzchild radius, we would suddenly (well, eight minutes later) notice a lack of light.
![if the sun turned into a black hole if the sun turned into a black hole](https://scitechdaily.com/wp-content/uploads/sites/1/nggallery/do-stars-fall-quietly-into-black-holes-or-crash-into-something-utterly-unknown/Do-Stars-Fall-Quietly-into-Black-Holes.jpg)
A star like ours would typically get colder and expand into a red giant, then collapse into a white dwarf (which has no fusion, just radiates residual heat from the collapse), forming a nebula about the size of the solar system in a nova (not super). Typically, a star must be about three solar masses before it is massive enough to collapse into a black hole. The gravity of such a tiny black hole would be exactly one gee at one earth-radius from the center. If this imaginary planet was even smaller, there would be some point that the gravity is so high light would not escape from the surface, that size is called the Schwarzchild radius (iirc). If you were to stand on this planet, but on a tower so that you would be at the same radial distance from the center of the planet as you are from the center of Earth now, you would feel the same gravity you do on Earth. If you stood on a planet with the same mass as Earth, but half the radius, there would be four times the gravity.
![if the sun turned into a black hole if the sun turned into a black hole](https://ordonews.com/wp-content/uploads/2020/05/Will-the-sun-ever-turn-into-a-black-hole-scaled.jpg)
Remember, the force of gravity varies inversely with the square of distance.
![if the sun turned into a black hole if the sun turned into a black hole](https://inspirationseek.com/wp-content/uploads/2016/02/Black-Hole-Art-Pictures.jpg)
It certainly wouldn't matter enough in the two weeks it would take to kill everything on the planet from lack of solar radiation.Ī black hole can be any mass, but the key is that the radius of the surface must be small enough that the surface gravity is high enough that light can't escape. Yes, the orbit might change a slight bit, but it would not be the cataclysmic adjustment you are proposing. by the time you get far enough away from the singularity that we find a planet - and, even moreso to Earth's orbit - the warping is, for all intents and purposes, the same. VERY near your singularity, the warping of spacetime (not the "space time continum") would be dramatically different than the warping near the edge of our sun, but. Which creates the greater indentation in the mattress? Now repeat the experiment with a tennis ball 2 feet away from the center and then observe. Very unlikely our orbit would remain the same and most likely it would alter dramatically.Īnalogy: Put a 20 pound depleted uranium golf ball sized mass and a 20 pound beach ball size mass on your bed. It bends the space time continuum much more severely and warps space around it. All the mass of the sun is concentrated in one point. The gravitometric density profile is radically altered. To the posters that think there would be net change because mass would be identical: